Revamp the document list experience by introducing a Finder-style window
interface with multiple views (icons, list, columns, gallery) and a new
sidebar filter system. Remove legacy folder and list item components in
favor of modular, windowed views. Integrate react-dnd-touch-backend and
custom DnD context for improved drag-and-drop, including mobile support.
Update uploader and dialog styles for consistency. Extend document types
to support new view modes, icon sizing, and sidebar state.
